There are many types of thermocouples, each designed for specific temperature ranges and applications. The most common types are labeled with letter combinations, such as:

  1. Type K: Chromel (Ni-Cr) vs. Alumel (Ni-Al)
  2. Type J: Iron (Fe) vs. Constantan (Cu-Ni)
  3. Type T: Copper (Cu) vs. Constantan (Cu-Ni)
  4. Type E: Chromel (Ni-Cr) vs. Constantan (Cu-Ni)
  5. Type N: Nicrosil (Ni-Cr-Si) vs. Nisil (Ni-Si)
  6. Type S: Platinum (Pt) vs. Rhodium (Rh)
  7. Type R: Platinum (Pt) vs. Rhodium (Rh)

These thermocouple types have different temperature ranges, accuracies, and applications. Type K is one of the most widely used thermocouples and is suitable for a broad range of temperatures. The others are used in specific industrial or laboratory applications based on their unique characteristics.

It’s important to select the right type of thermocouple for a particular application to ensure accurate temperature measurement within the desired temperature range.